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CN103140338B - Comprise the pneumatic tire of self-adhesive composite reinforcement - Google Patents

Comprise the pneumatic tire of self-adhesive composite reinforcement Download PDF

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Publication number
CN103140338B
CN103140338B CN201180045876.2A CN201180045876A CN103140338B CN 103140338 B CN103140338 B CN 103140338B CN 201180045876 A CN201180045876 A CN 201180045876A CN 103140338 B CN103140338 B CN 103140338B
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CN
China
Prior art keywords
styrene
silk thread
thermoplastic
tire
reinforcing body
Prior art date
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Application number
CN201180045876.2A
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Chinese (zh)
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CN103140338A (en
Inventor
V·阿巴德
S·里戈
E·库斯托代罗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe de Technologie Michelin SAS
Original Assignee
Compagnie Generale des Etablissements Michelin SCA
Michelin Recherche et Technique SA France
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Publication of CN103140338A publication Critical patent/CN103140338A/en
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Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/02Elements
    • C08K3/08Metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00Producing pneumatic or solid tyres or parts thereof
    • B29D30/06Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/38Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B15/00Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
    • B29B15/08Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B15/00Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
    • B29B15/08Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
    • B29B15/10Coating or impregnating independently of the moulding or shaping step
    • B29B15/12Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length
    • B29B15/122Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length with a matrix in liquid form, e.g. as melt, solution or latex
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00Producing pneumatic or solid tyres or parts thereof
    • B29D30/06Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/38Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B29D2030/383Chemical treatment of the reinforcing elements, e.g. cords, wires and filamentary materials, to increase the adhesion to the rubber
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • Y10T428/2933Coated or with bond, impregnation or core
    • Y10T428/294Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Ropes Or Cables (AREA)
  • Tires In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

Comprise the pneumatic tire of composite reinforcing body (R-2), described composite reinforcing body is by solidification and diene rubber matrix autoadhesion, and described composite reinforcing body comprises :-one or more reinforcement silk thread (20), such as carbon steel cord; The layer of-thermoplastic polymer composition, its coated described silk thread, the coated several silk thread of coated each silk thread or collectivity ground individually, described thermoplastic polymer composition comprise on the one hand glass transition temperature be on the occasion of thermoplastic polymer, comprise the unsaturated thermoplastic styrene elastomer that glass transition temperature is negative value on the other hand.

Description

Comprise the pneumatic tire of self-adhesive composite reinforcement
Technical field
The field of the invention is for airtyred stiffening members or reinforcing body, especially metal reinforcement body.
The present invention relates more specifically to the pneumatic tire of mixed type or compound reinforcing body reinforcement, described reinforcing body is by least one core body, particularly metallic core is formed, and described core body is covered (sheath) by the sheath coated (cover) of one deck thermoplastic or a thermoplastic or cover.
Background technology
Use thermoplastic; such as polyamide or polyester are as the sheath known considerable time of metal reinforcement body; particularly be used for protecting these reinforcing body not corrode by polytype outside; such as oxidation or wearing and tearing; or for the object of structure rigidifying; by all kinds of silk thread (thread) or silk thread assembly such as cord (cord) being bonded together, and improve their resistance to bending thus especially.
Such composite reinforcing body and their purposes in rubber such as pneumatic tire have been described in many patent documents.
Such as, patent application EP0962562 describes the reinforcing body be made up of steel or kevlar fabric, and for improving its object of wearability, it is covered by thermoplastic such as polyester or polyamide cover.
Patent application FR2601293 describes with the sheath of polyamide as metal cords, and it to be used as the bead in pneumatic tire tyre bead, such sheath advantageously makes the shape of this bead be applicable to structure and the condition of work of the pneumatic tire tyre bead of its reinforcement.
Patent document FR2576247 and US4,754,794 also illustrate metal cords or tinsel, it can be used as the bead in pneumatic tire tyre bead, these silk threads or cord by two kinds or even three kinds of different thermoplastic material (such as polyamide) double braid coverings with different melting points to cover or even three layers of cover cover, its object is control the distance between these silk threads or cord on the one hand, and be the risk eliminating friction loss or corrosion losses on the other hand, they to be used as the bead in pneumatic tire tyre bead.
Use these reinforcing body that polyester or polyamide material cover cover thus except the advantage of above-mentioned corrosion resistance, wearability and structural rigidity, their important advantages use the simple textile binding agent being called as RFL (Resorcin-Formaldehyde-Latex) adhesive to bond with diene rubber matrix subsequently, described diene rubber matrix comprises at least one diene elastomer such as natural rubber, described adhesive is known can provide fabric fibre, such as polyester or gratifying bonding between Fypro and diene rubber.
Therefore, use the metal reinforcement body not being coated with adhesion metal layer such as brass, and it may be favourable that use does not contain metallic salts such as the rubber matrix of the surrounding of cobalt salt, described slaine known for maintenance through time cohesive be necessary, but it significantly increases the cost of rubber matrix itself on the one hand, and increase their oxidation and ageing sensitivity (see such as patent application WO2005/113666) on the other hand.
But above RFL adhesive also has shortcoming: particularly they comprise formaldehyde as base material, due to the current change in the European directive about the type product, formaldehyde is the material being hoped to remove from adhesive composition on long terms.
Therefore, pneumatic tire manufacturer is seeking to alleviate the new adhesive system of above-mentioned all or part shortcoming or new reinforcing body at present.
Summary of the invention
At present, applicant has found a kind of composite reinforcing body in its process studied, and it does not need applying glue process to come and rubber adhesion, be the type by solidifying autoadhesion, and therefore it can make above-mentioned purpose be achieved under certain meaning.
Therefore, the first theme of the present invention is the pneumatic tire comprising composite reinforcing body, and described composite reinforcing body comprises:
-one or more reinforcement silk thread;
The layer of-thermoplastic polymer composition, its coated described silk thread, the coated several silk thread of coated each silk thread or collectivity ground individually, described thermoplastic polymer composition comprise on the one hand glass transition temperature be on the occasion of thermoplastic polymer, comprise the unsaturated thermoplastic styrene elastomer that glass transition temperature is negative value on the other hand.
Unexpectedly, found the existence of this unsaturated thermoplastic styrene elastomer make likely to guarantee described composite reinforcing body directly (namely not containing RFL adhesive or other adhesive any) and securely with diene elastomer matrix or composition, be such as widely used in those compositions bonding in tire.
The invention still further relates to the purposes of above-mentioned composite reinforcing body as stiffening members, described stiffening members is used for pneumatic tire, especially wish to be arranged on passenger car type automobile, SUVs (" sport utility vehicle "), two wheeler (particularly bicycle or motorcycle), aircraft or industrial vehicle, it is selected from van, " heavy type " vehicle, i.e. underground train, bus, heavy road surface haulage vehicle (truck, tractor, trailer), non-road vehicles such as agricultural machinery or civil engineering machine, and other transport or operate those tires on vehicle.
According to the following description and embodiment, and the accompanying drawing schematically shown combining these embodiments relevant will easily understand the present invention and advantage thereof:
-Fig. 1 display is applicable to the cross section of an example of airtyred composite reinforcing body of the present invention;
-Fig. 2 display is applicable to the cross section of another example of airtyred reinforcing body of the present invention;
-Fig. 3 display is applicable to the cross section of another example of airtyred reinforcing body of the present invention;
-Fig. 4 display is applicable to the cross section of another example of airtyred reinforcing body of the present invention; With
-Fig. 5 shows the airtyred radial section according to present invention adds this composite reinforcing body with radial carcass reinforcement.
Detailed description of the invention
In this manual, unless otherwise its place's explanation, all percentage (%) represents percentage by weight.
In addition, represented from being greater than a by statement " between a-b " any codomain of defining and (namely do not comprise end value a and b), and any codomain defined by statement " a-b " represents from a until the codomain of b (namely comprises accurate end value a and b) to the codomain being less than b.
The airtyred composite reinforcing body of the present invention can by solidification directly and unsaturated rubber composition bond, therefore there is following principal character:
-at least one reinforcement silk thread (i.e. one or more reinforcement silk thread);
The layer of-thermoplastic polymer composition, it is coated described silk thread individually, and the coated several silk thread of coated each silk thread or collectivity ground, described thermoplastic polymer composition comprises glass transition temperature (hereinafter referred to as Tg on the one hand 1) on the occasion of (being namely greater than 0 DEG C) thermoplastic polymer, on the other hand comprise glass transition temperature (hereinafter referred to as Tg 2) be the unsaturated thermoplastic styrene elastomer of negative value (being namely less than 0 DEG C).
That is, this composite reinforcing body comprises single reinforcement silk thread or several reinforcement silk thread, each reinforcement silk thread by the layer (individual layer) of thermoplastic polymer composition or sheath institute coated.The structure of this reinforcing body is hereafter being described in detail.
In this application, term " reinforcement silk thread " is generally understood as any elongated member representing and have greater depth relative to its cross section, the no matter shape of its cross section, such as circle, ellipse, rectangle, square or or even flat, this silk thread can also be straight or not be straight, such as, be torsion or corrugated.
This reinforcement silk thread can adopt any known form.Such as, it can be major diameter (such as, and be preferably equal to or greater than 50 μm) independent monofilament (monofilament), independently bar, multifilament fiber (has minor diameter by several, usually independent long filament (filament) composition of 30 μm is less than), by several twisting (twisted) processbearing astrocyte fabric stock yarn together, by also twisting with the fingers (cabled) or twisting several fiber together or meristogenetic fabric or metal curtain line or belt or bar, described band or bar comprise together in groups, along Main way arrangement be no matter whether such as directly to several such monofilament, fiber, stock yarn or cord.
The diameter of described reinforcement silk thread or each reinforcement silk thread is preferably less than 5mm, especially in the scope of 0.1-2mm.
Preferably, described reinforcement silk thread is metal reinforcement silk thread, particularly carbon steel wire, such as, be used in those in tire steel cord.But, certainly can use the steel of other types, as stainless steel.When use carbon steel time, its carbon content preferably between 0.4%-1.2%, particularly between 0.5%-1.1%.The present invention is specially adapted to have any steel of steel cord type of standard or NT (" conventional stretch ") intensity, height or HT (" high stretching ") intensity, very high or SHT (" Ultra-Drawing ") intensity or high or UHT (" high stretching ") intensity.
Described steel can be coated with adhesive phase, such as layer of brass or zinc layers.But, also can advantageously use light, namely uncoated steel.In addition, according to the present invention, wish the rubber composition by metal reinforcement reinforcement body of the present invention, no longer need to use metallic salts as cobalt salt in its formula.
First the thermoplastic polymer composition forming above-mentioned layer or sheath comprises thermoplastic polymer, and it has positive Tg (with Tg according to definition 1represent), it is preferably greater than+20 DEG C, and more preferably greater than+30 DEG C.In addition, the fusing point (claiming to represent with Tm) of this thermoplastic polymer is preferably greater than 100 DEG C, more preferably greater than 150 DEG C, and is greater than 200 DEG C especially.
This thermoplastic polymer is preferably selected from polyamide, polyester and polyimides, is more specifically selected from aliphatic polyamide and polyester.In the polyester, PET (PETG), PEN (PEN), PBT (polybutylene terephthalate (PBT)), PBN (PBN), PPT (PTT) and PPN (poly-naphthalenedicarboxylic acid propylene glycol ester) can such as be mentioned.In aliphatic polyamide, polyamide 4 can be mentioned especially, 6,6,6,6,11 and 12.This thermoplastic polymer is preferably aliphatic polyamide, is more preferably polyamide 6 or polyamide 11.
Second key component of thermoplastic polymer composition is unsaturated thermoplastic styrene elastomer, and it has negative Tg (Tg according to definition 2) value, it is preferably less than-20 DEG C, and is more preferably less than-30 DEG C.
Therefore and according to the preferred embodiments of the invention, described thermoplastic polymer and the elastomeric glass transition temperature difference of unsaturated TPS (Tg 1-Tg 2) be greater than 40 DEG C, more preferably greater than 60 DEG C.
Here should notice that TPS (thermoplastic styrene) elastomer is the thermoplastic elastomer (TPE) of styrene-based block copolymer form.These thermoplastic elastomer (TPE)s between thermoplastic polymer and elastomer with intermediate structure are known is connected by polystyrene hard segment by elastomer soft chain segment (as polybutadiene, polyisoprene or poly-(ethylene/butylene)) sequence and formed.
Known this is the reason that TPS copolymer is characterized by existence two glass transition peaks usually, first (lower, negative temperature, corresponding Tg 2) elastomeric blocks of the corresponding TPS copolymer in peak, and thermoplastic portions's (styrene block) of second corresponding TPS copolymer in (higher, positive temperature, usually at about 80 DEG C) peak.
The elastomer of these TPS elastomers normally three blocks, it has two hard segments connected by soft chain segment.Described hard segment and soft chain segment can arrange in linear form or with star configuration or cladodification structure.These TPS elastomers can also be the diblock elastomers that single hard segment is connected with soft chain segment.Usually, each in these segments or block comprises and is minimumly greater than 5, is generally greater than the base unit (styrene units such as when styrene/isoprene/styrene block copolymer and isoprene unit) of 10.
Draw attention to, the elastomeric essential attributes of the TPS used in composite reinforcing body of the present invention is that it is the undersaturated fact.According to definition, and will state " TPS elastomer " with knowing be interpreted as the TPS elastomer comprising ethylenic unsaturated group, that is, it comprises carbon-to-carbon double bond (no matter whether being conjugation).On the contrary, yes does not comprise the TPS elastomer of such double bond for saturated TPS elastomer.
Preferably, described unsaturated elastic body is the copolymer comprising styrene (i.e. polystyrene) block and diene (i.e. polydiene) block, particularly isoprene (polyisoprene) or butadiene (polybutadiene) block.Such elastomer is selected from phenylethylene/butadiene (SB) especially, styrene/isoprene (SI), styrene/butadiene/butylene (SBB), phenylethylene/butadiene/isoprene (SBI), styrene/butadiene/styrene (SBS), styrene/butadiene/butylene/styrene (SBBS), styrene/isoprene/styrene (SIS), phenylethylene/butadiene/the block copolymer of isoprene/styrene (SBIS) and the blend of these copolymers.
More preferably, this unsaturated elastic body is three block type copolymer, and it is selected from the mixture of styrene/butadiene/styrene (SBS), styrene/butadiene/butylene/styrene (SBBS), styrene/isoprene/styrene (SIS), phenylethylene/butadiene/isoprene/styrene (SBIS) block copolymer and these copolymers; More specifically, it is SBS or SIS, particularly SBS.
According to another preferred embodiment of the present invention, the styrene-content in described unsaturated TPS elastomer is between 5-50%.Outside described scope, technique effect desired by existence is no longer optimum risk, namely trade off relative to the fusible of described thermoplastic polymer layer on the one hand, the fusible of diene elastomer of wishing further relative to described reinforcing body is on the other hand traded off.For those reasons, styrene-content is more preferably between 10-40%.
Elastomeric number-average molecular weight (the M of described TPS n) preferably at 5000-500000g/mol, more preferably between 7000-450000.In a known way, the elastomeric number-average molecular weight (M of TPS is measured by SEC (size exclusion chromatograph) n).Sample is first dissolved in oxolane with the concentration being about 1g/L, then before sample introduction, the filter in 0.45 μm of aperture filters this solution.The equipment used is WATERSAlliance chromatograph.Eluting solvent is oxolane, and flow velocity is 0.7ml/min, and system temperature is 35 DEG C, and analysis time is 90min.Tandem ground uses WATERS " STYRAGEL " post (HMW7 post, a HMW6E post and two HT6E posts) of a set of 4.The sampling volume of this polymer samples solution is 100 μ l.Detector is WATERS2410 differential refractometer, and is WATERSMILLENIUM systems for the treatment of the related software of chromatograph data.The mean molecule quantity calculated is the molecular weight relative to the calibration curve using polystyrene standards to obtain.
Unsaturated TPS elastomer as SB, SBS, SBBS, SIS or SBIS be know and can title " KratonD " purchased from Kraton company (product D1161, D1118, D1116, D1163 as in the elastomeric situation of SB, SIS and SBS), can title " Calprene " purchased from Dynasol company (products C 405, C411 and C412 as in the elastomeric situation of SBS), or can title " Tuftec " purchased from Asahi company (product P 1500 as in the elastomeric situation of SBBS).
Glass transition temperature (the Tg of above-mentioned thermoplastic polymer 1and Tg 2) such as and except difference described in this application illustrate, according to ASTMD3418 (1999) standard, by DSC (differential scanning calorimeter), measure in known manner.
The Fig. 1 enclosed show schematically show, and (not according to concrete scale) is applicable to the cross section of the first example of the composite reinforcing body of tire of the present invention.Be made up of reinforcement silk thread (10) with this composite reinforcing body that R-1 represents, described reinforcement silk thread (10) is by having relative major diameter (such as, single long filament 0.10-0.50mm) or monofilament composition, such as be made up of carbon steel, reinforcement silk thread (10) is coated by layer (11), and described layer (11) comprises on the one hand and has positive glass transition temperature (Tg 1) thermoplastic polymer, be such as made up of polyamide or polyester, and comprise on the other hand there is negative glass transition temperature (Tg) 2) unsaturated TPS elastomer, such as SB, SBS, SBBS, SIS or SBIS; The minimum thickness of this layer is in FIG with E mrepresent.
Fig. 2 schematically shows the cross section of the second example of the composite reinforcing body being applicable to tire of the present invention.Be made up of reinforcement silk thread (20) with this composite reinforcing body that R-2 represents, reinforcement silk thread (20) is in fact by two single long filaments or the monofilament (20a with relative major diameter (such as between 0.10-0.50mm), 20b) twisting or and twist with the fingers form together, it is such as made up of carbon steel.This reinforcement silk thread (20) is by having minimum thickness E mlayer (21) coated, described layer (21) comprises on the one hand and has positive glass transition temperature (Tg 1) thermoplastic polymer, be such as made up of polyamide or polyester, and comprise on the other hand there is negative glass transition temperature (Tg 2) unsaturated TPS elastomer, such as SB, SBS, SBBS, SIS or SBIS.
Fig. 3 schematically illustrates the cross section of another example of the composite reinforcing body being applicable to tire of the present invention.This composite reinforcing body represented with R-3 is made up of 3 reinforcement silk threads (30), each reinforcement silk thread is by two monofilament (30a with relative major diameter (such as between 0.10-0.50mm), 30b) twisting or and twist with the fingers form together, it is such as made up of steel or carbon.Coated by layer (31) by the assembly that formed of reinforcement silk thread (30) of such as three alignment, described layer (31) comprises on the one hand and has positive glass transition temperature (Tg 1) thermoplastic polymer, be such as made up of polyamide or polyester, and comprise on the other hand there is negative glass transition temperature (Tg 2) unsaturated TPS elastomer, such as SB, SBS, SBBS, SIS or SBIS.
Fig. 4 schematically illustrates the cross section of another example of the composite reinforcing body being applicable to tire of the present invention again.This composite reinforcing body R-4 comprises reinforcement silk thread (40), it is made up of the steel cord of 1+6 structure, its 6 long filaments (41b) having center line or core body line (41a) and have same diameter, described 6 long filaments are spirally wrapped around together around center line.This reinforcement silk thread or cord (40) coated by polymer composition layer (42), described polymer composition comprises polyamide on the one hand, comprises SBS elastomer on the other hand.
Such as, at the composite reinforcing body of tire of the present invention, in those reinforcing body schematically shown in above-mentioned Fig. 1 to 4, around the minimum thickness E of the sheath of one or more reinforcement silk thread mconcrete working condition of the present invention may be depended on and widely change.It is preferably between 1 μm of-2mm, more preferably between 10 μm of-1mm.
If use several reinforcement silk thread (especially several cord), coating or sheath can be deposited on (especially on each cord) on each reinforcement silk thread individually and (draw attention to, these reinforcement silk threads can or can not be single), it is as such as shown in above-mentioned Fig. 1,2 and 4, or also can be deposited on appropriate (such as aliging along principal direction) several reinforcement silk thread arranged (especially on several cord), it as shown for example in figure 3 collectivity.
The composite reinforcing body of tire of the present invention is prepared by ad hoc approach, described method comprises at least following step, according to this step, cover is carried out at least one (namely one or more) reinforcement silk thread and covers operation, it is preferably through extruder head, to cover with the layer cover of above-mentioned thermoplastic polymer composition, described thermoplastic polymer composition comprises and has positive glass transition temperature (Tg 1) thermoplastic polymer and there is negative glass transition temperature (Tg 2) unsaturated thermoplastic styrene elastomer.
In the manner known to persons skilled in the art, carry out above-mentioned cover to on-line continuous and cover step.Such as, it comprises the die head making described reinforcement silk thread pass through the suitable diameter be heated in the extruder head of proper temperature briefly.
According to preferred embodiment, before passing into extruder head, such as, pass through eddy-current heating or pass through IR radiation by the preheating of one or more described reinforcement silk thread.When leaving this extruder head, such as, use cold air or other gas, or by by described reinforcement silk thread by water-bath and drying steps subsequently, and overlap the one or more reinforcement silk threads covered described in making thus and fully cool, solidify to make polymeric layer.
Therefore the composite reinforcing body obtained can directly be heat-treated alternatively after extrusion or after cooling.
Such as, for obtaining the reinforcement silk thread covered through cover that overall diameter is about 1mm, it is the reinforcement silk thread of about 0.6mm by diameter, be such as the metal cords (illustrating as exemplified in fig. 2) that the independent monofilament of two of 0.3mm is simply formed by the diameter of twisting together, be that the polyamide 11 of about 0.4mm and SBS or SB elastic composition (weight ratio 85/15) are coated with maximum gauge, described extrude/overlap cover production line and comprise two die heads, the diameter of the first die head (reverse die head or upstream die head) is about 0.65mm, and the diameter of the second die head (or downstream die head) is about 0.95mm, two die heads are placed in the extruder head being heated to about 210 DEG C.When covering head with the silk thread speed of service of tens of m/min of the routine under the extruder pump speed of the tens of g/min relative to routine by cover, the polyamide melted at the temperature of 210 DEG C in this extruder and the elastomeric mixture of TPS are coated on described cord.When leaving this cover and covering die head, this cord can be immersed and be filled with in the groove of cold water, to cool before take-up reel passes into oven drying.
Step is covered for above-mentioned cover, before passing into extruder head, advantageously cord (reinforcement silk thread) can be carried out preheating, such as, through by HF generator or pass through heat tunnel.
After this cover covers operation, namely when leaving sheath head, this composite reinforcing body can directly such as by tunnel type baking oven, and such as several meters high, so that wherein through aerial heat treatment.This treatment temperature is such as between 150 DEG C-300 DEG C, according to circumstances through the processing time (such as 10 seconds to 10 minutes) of several seconds to several minutes, it is believed that the duration of the higher process of temperature will be shorter, and heat treatment must not make used thermoplastic remelting or even overbate.The composite reinforcing style of the present invention completed thus as advantageously cooled in atmosphere, to avoid, when being wrapped in last take-up reel, undesirable sticking problem occurs.
In due course, those skilled in the art can know the duration how regulating temperature and above-mentioned optional heating according to concrete operations condition of the present invention, particularly according to the definite character of manufactured composite reinforcing body, particularly according to this process whether in the combination of independent monofilament, the cord be made up of several monofilament or these monofilament or cord, bar such as, carry out.Especially, those skilled in the art can change treatment temperature and processing time easily, make to find by continuous approximation the operating condition giving each specific embodiments optimum adhesion result of the present invention.
The step of method advantageously can be supplemented and be carried out three-dimensional cross-linked last process to reinforcing body as above, to improve the intrinsic cohesiveness of its sheath further, if particularly wish that this composite reinforcing body is finally at relatively-high temperature, use at 100 DEG C.
This is cross-linked and is undertaken by any known method, such as by the bombardment of Physical cross linking methods such as ion or electronics, or pass through Chemical Crosslinking Methods, such as when being extruded, crosslinking agent (as linseed oil) is mixed in this thermoplastic polymer and TPS elastic composition, or by vulcanizing system (i.e. sulfenyl cross-linking system) is mixed in said composition.
The airtyred setting up period of composite reinforcing reinforcement body of the present invention is made in hope, by being present in for the manufacture of the intrinsic cross-linking system in the diene rubber compsns of this tire, and by making this pneumatic tire contact with composite reinforcing body of the present invention, also can be cross-linked.
Above-mentioned composite reinforcing body directly can be used as the stiffening members in pneumatic tire, that is without the need to any additional adhesive composition.Advantageously, it can be used for reinforcement all types vehicle, particularly the pneumatic tire of passenger car type automobile or industrial vehicle such as heavy vehicle.
Such as, the Fig. 5 enclosed show schematically show (not according to special ratios describe) passenger vehicle airtyred radial section of the present invention.
This pneumatic tire 1 comprises by crown stiffener or crown 2, two sidewalls 3 and two tyre beads 4 of being with 6 reinforcement, and each in these tyre beads 4 is by bead 5 reinforcement.Crown 2 there is tyre surface (not showing in this schematic diagram).Carcass reinforcement 7 is wrapped in two bead 5 in each tyre bead 4, and the turning part (upturn) 8 of this stiffener 7, such as towards the outside of tire 1, shows on its wheel rim 9 being arranged on it at this.As is known, carcass reinforcement 7 is made up of at least one cord ply (ply) by cord reinforcement, i.e. so-called " meridian " cord, the cord of such as fabric or metal, that is, these cords are actual to be arranged parallel to each other, and extend to another tyre bead from a tyre bead, make with middle circumferential plane (perpendicular to the plane of tire rotating shaft, it is positioned at the intermediate distance place of two tyre beads 4, and through the centre of crown stiffener 6) in the angle 80 °-90 °.
This pneumatic tire 1 of the present invention such as has the essential feature that at least one crown stiffener or carcass reinforcement comprise composite reinforcing body as above.According to another possible embodiment of the present invention, such as, bead 5 can be become by this composite reinforcing system.
embodiment
the manufacture of test 1-composite reinforcing body
First the composite reinforcing body being applicable to tire of the present invention is manufactured as follows.Initial reinforcement silk thread is pneumatic tire steel cord, and it is made up of standard steel (having the carbon content of 0.7 % by weight), present two diameters be 0.30mm, structure with 1 × 2 of the pitch of 10mm twisting independently silk thread together or monofilament.Cord diameter is 0.6mm.
This cord be extrude-overlap cover on production line by make its by extruder head with polyamide 11 on the one hand (from the RilsenBESNOP40TL of Arkema company; T mfor about 180 DEG C) and the mixture of SBS or SB (being respectively D1155 and D1118 of Kraton company) on the other hand come coated, described extruder head is heated to 210 DEG C of temperature, and has the upstream die head of two die heads-diameter 0.63mm and the downstream die head of diameter 0.92mm.The thermoplastic mixture be made up of polyamide 11 (pump speed is about 51g/min) and SBS or SB (pump speed is about 9g/min) is heated to 210 DEG C of temperature, and this silk thread (making it be preheated to about 174 DEG C by HF generator) that the speed being therefore coated with 60m/min is run.When leaving cover and covering head, before use air nozzle carries out drying, gained composite reinforcing body runs through the cooling bath being filled with 5 DEG C of water continuously, cools to make its thermoplastic sheath.
The glass transition temperature Tg of the two kinds of polymer more than used 1and Tg 2equal about+45 DEG C respectively (such as, to measure according to following method of operating: 822-2DSC instrument, purchased from MettlerToledo with-95 DEG C; Helium atmosphere, from room temperature (20 DEG C) preheating sample to 100 DEG C (with 20 DEG C/min)), be then cooled to-140 DEG C rapidly, final entry is with the DSC curve of 20 DEG C/min from-140 DEG C to+250 DEG C afterwards.
After this cover covers operation, in these embodiments, by it to be heated to 3m/min the temperature of 270 DEG C under atmospheric environment (air) by tunnel type baking oven, assembly is carried out to the heat treatment of about 100 second time.This produces the composite reinforcing part (the stiffener R-2 schematically shown in Fig. 2) being applicable to tire of the present invention, and it is formed by overlapping with aramid layer and elastomer (SBS or SB) the initial steel cord covered, and its cohesive is best.
In order to determine heat treated optimum operation condition in above test, test 4 processing times (50 seconds, 100 seconds, 200 seconds and 400 seconds) of the temperature range of 160 DEG C-280 DEG C in advance.
the test of test 2-cohesive
Then, by test to the bond quality evaluation between rubber and the composite reinforcing body as above manufactured, in described test, measure from vulcanizate compositions, be also called in vulcanized rubber the power pulled out needed for described reinforcing body.This rubber composition is the conventional composition for extruded metal tire belt cord ply based on natural rubber, carbon black and standard additive.
Described vulcanized rubber is of a size of 200mm × 4.5mm by two, and the jacket body that thickness is 3.5mm is relatively applied in the block rubber (thickness of gained block rubber is 7mm thus) formed together before curing.In the manufacture process of this block rubber, described composite reinforcing body (amounting to 15 strands) by bundle envelope (imprison) between with two of its uncured state sheet rubbers, described composite reinforcing body is spaced, and one end of each composite reinforcing body is all protruded on the both sides of this sheet rubber, and bulge quantity is enough to carry out posterior drawing test.Then the block comprising this reinforcing body is placed in suitable mould, then cure under pressure.Regulate by leave for those skilled in the art ruling solidification temperature and hardening time be suitable for wish test condition.Such as, in this case, described block at 160 DEG C, at the cure under pressure 15 minutes of 16bar.
After solidification, the sample that vulcanized block and 15 bursts of reinforcing body are formed is placed between the fixture of suitable stretching testing machine, with this individually by each reinforcing body under given draw speed and given temperature (such as in this case respectively at 50mm/min and 100 DEG C) tractive go out rubber.By measuring, reinforcing body is pulled out the pullout forces of sample (by F maxrepresent) (this is the mean value of 15 extension tests) characterize level of adhesion.
It is found that, although in fact not containing RFL adhesive (or other adhesive any), composite reinforcing body of the present invention has and is equivalent to about 52% (SB elastomer) of comparative pullout forces or the high pullout forces F of 57% (SBS elastomer) max, described comparative pullout forces is only covering with polyamide 11 cover, and the comparative composite reinforcing body using conventional RFL adhesive to bond records, and described high pullout forces forms remarkable result to those skilled in the art.
Under the same conditions, only have polyamide 11 (without SBS elastomer) to overlap and cover and do not show rubber without cohesive (in fact pullout forces is 0) containing the comparative composite reinforcing body of RFL adhesive (or other adhesive any).
Extra test also proves, the use of unsaturated TPS elastomer (SB or SBS), it is not the component being used as cover coating, but as the adhesive (and therefore always contacting with composite reinforcing body) be incorporated in rubber calendering composition, said composition does not provide adhesive effect.
Therefore, due to the level of adhesion of gained, composite reinforcing body of the present invention is because the characteristic of its self adhesion and for using the composite reinforcing body of the thermoplastic prior art of protecting as polyamide or polyester cover (known its needs to use RFL adhesive to guarantee they and rubber adhesion) to be particularly useful and substitute completely reliably.

Claims (14)

1. comprise the pneumatic tire of composite reinforcing body, described composite reinforcing body comprises:
-one or more reinforcement silk thread;
-monolayer thermoplastic polymer composition layer, its coated described silk thread, the coated several silk thread of coated each silk thread or collectivity ground individually, described thermoplastic polymer composition comprise on the one hand glass transition temperature be on the occasion of thermoplastic polymer, comprise the unsaturated thermoplastic styrene elastomer that glass transition temperature is negative value on the other hand.
2. tire according to claim 1, the glass transition temperature of wherein said thermoplastic polymer is higher than+20 DEG C.
3. the tire described in claim 1 or 2, the glass transition temperature of wherein said unsaturated thermoplastic styrene elastomer is lower than-20 DEG C.
4. the tire described in claim 1 or 2, the difference of the glass transition temperature of wherein said thermoplastic polymer and described unsaturated thermoplastic styrene elastomer is greater than 60 DEG C.
5. the tire described in claim 1 or 2, wherein said thermoplastic polymer is aliphatic polyamide or polyester.
6. tire according to claim 5, wherein said thermoplastic polymer is polyamide 6 or polyamide 11.
7. the tire described in claim 1 or 2, wherein said thermoplastic elastomer (TPE) is the copolymer comprising styrene block and diene block.
8. tire according to claim 7, wherein said diene block is isoprene block or butadiene block.
9. tire according to claim 8, wherein said thermoplastic elastomer (TPE) is selected from phenylethylene/butadiene (SB), styrene/isoprene (SI), styrene/butadiene/butylene (SBB), phenylethylene/butadiene/isoprene (SBI), styrene/butadiene/styrene (SBS), styrene/butadiene/butylene/styrene (SBBS), styrene/isoprene/styrene (SIS), the phenylethylene/butadiene/block copolymer of isoprene/styrene (SBIS) and the blend of these copolymers.
10. tire according to claim 9, wherein said thermoplastic elastomer (TPE) is SBS or SIS copolymer.
Tire described in 11. claims 1 or 2, wherein said thermoplastic elastomer (TPE) comprises the styrene between 5-50 % by weight.
Tire described in 12. claims 1 or 2, the minimum thickness of wherein said layer is between 1 μm of-2mm.
Tire described in 13. claims 1 or 2, wherein said reinforcement silk thread is metal wire.
14. tires according to claim 13, wherein said metal wire is carbon steel wire.
CN201180045876.2A 2010-09-23 2011-09-16 Comprise the pneumatic tire of self-adhesive composite reinforcement Active CN103140338B (en)

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FR1057666A FR2965209B1 (en) 2010-09-23 2010-09-23 SELF-ADHERENT COMPOSITE REINFORCEMENT
FR1057666 2010-09-23
PCT/EP2011/066113 WO2012038341A1 (en) 2010-09-23 2011-09-16 Tyre cover comprising a self-adherent composite reinforcement

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EP2618976A1 (en) 2013-07-31
WO2012038341A1 (en) 2012-03-29
FR2965209A1 (en) 2012-03-30
JP2013542119A (en) 2013-11-21
US20130280511A1 (en) 2013-10-24
KR20130108365A (en) 2013-10-02
CN103140338A (en) 2013-06-05
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BR112013005826A8 (en) 2018-01-02
BR112013005826A2 (en) 2017-11-14

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